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All Journal ASEAN Journal of Systems Engineering Buletin Peternakan Jurnal Rekayasa Proses Reaktor Jurnal Ilmu Lingkungan JURNAL TEKNOLOGI LINGKUNGAN Jurnal Bahan Alam Terbarukan Eksergi: Chemical Engineering Journal Jurnal Ketahanan Nasional Seminar Nasional Teknik Kimia Kejuangan Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) Jurnal Pamator : Jurnal Ilmiah Universitas Trunojoyo Madura Majalah Kulit, Karet, dan Plastik Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) Jurnal Sains & Teknologi Lingkungan Konversi Metal Indonesia Jurnal Penelitian Pendidikan IPA (JPPIPA) Indonesian Journal of Chemistry Communications in Science and Technology Jurnal Rekayasa Proses Jurnal Ilmiah Pendidikan dan Pembelajaran Media Ilmiah Teknik Lingkungan Jurnal Pascapanen dan Bioteknologi Kelautan dan Perikanan INSIST (International Series on Interdisciplinary Research) Jurnal Inovasi Teknik Kimia Jurnal Engine: Energi, Manufaktur, dan Material ASEAN Journal of Chemical Engineering Kontribusia : Research Dissemination for Community Development Jurnal Riset Entrepreneurship GANDRUNG: Jurnal Pengabdian Kepada Masyarakat Jurnal Pengendalian Pencemaran Lingkungan (JPPL) Sosial : Jurnal Ilmu-Ilmu Sosial Community Empowerment Prosiding SNAST International Journal of Computer and Information System (IJCIS) Teknika STTKD: : Jurnal Teknik, Elektronik, Engine Envirotek : Jurnal Ilmiah Teknik Lingkungan Sharia Agribusiness Journal Journal of Educational and Cultural Studies Hexagon DEDIKASI : Jurnal Pengabdian Kepada Masyarakat Jurnal Edukasi Pengabdian Masyarakat: EDUABDIMAS Revenue Manuscript Jurnal Rekayasa Proses Jurnal Pengabdian, Riset, Kreativitas, Inovasi, dan Teknologi Tepat Guna (Parikesit) Educational Management

Agus Prasetya

Universitas Gadjah Mada

Author-ID : 345050

Religion Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Social Sciences Transportation Veterinary Other

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SINTESIS GLISEROL KARBONAT DARI GLISEROL DAN UREA MENGGUNAKAN KATALIS RESIN INDION 225 Na Alfiana Adhitasari; Hary Sulistyo; Agus Prasetya
Reaktor Volume 17 No. 3 September 2017
Publisher : Dept. of Chemical Engineering, Diponegoro University

Abstract KINETIC STUDY OF GLYCEROL CARBONATE SYNTHESIS FROM GLYCEROL AND UREA USING INDION 225 Na AS CATALYST. The using of biodiesel as an alternative energy source that is renewable causes the increasing of glycerol as byproduct of biodiesel production. It makes the selling value of glycerol decreases. Glycerol processing is needed to increase the selling value of glycerol in the market. One of the glycerol derivative is glycerol carbonate. Glycerol carbonate is used as adhesives, solvents, inks, surfactants, and lubricants. This research was carried out by reacting glycerol and urea in a batch reactor using Indion 225 Na as catalyst. The purpose of this study was to determine the best conditions of synthesis of glycerol carbonate. The results showed that the obtained optimum conversion of glycerol was 48.43% with ratereaction is 0.1296 hr-1 and the ativation energy is 17.0628 kJ/mol.K with frequency factor is 19.4199 hr-1 in the glycerol:urea ratio of 1:1, the catalyst concentration of 5% and a temperature of 130 0C in 5h of reaction. Kata kunci: glycerol; glycerol carbonate; indion 225 Na; urea Abstrak Penggunaan biodiesel sebagai alternatif sumber energi yang bersifat renewable mengakibatkan meningkatnya gliserol sebagai hasil samping produksi biodiesel. Peningkatan produksi gliserol berdampak terhadap nilai jual gliserol yang semakin menurun. Pengolahan gliserol perlu dilakukan untuk meningkatkan nilai jual gliserol di pasaran. Salah satu produk turunan gliserol adalah gliserol karbonat. Gliserol karbonat mempunyai kegunaan sebagai perekat, pelarut, tinta, surfaktan, dan pelumas. Penelitian ini dilakukan dengan mereaksikan gliserol dan urea dalam reaktor batch menggunakan katalis resin Indion 225 Na. Tujuan dari penelitian ini adalah untuk mengetahui kondisi terbaik sintesis gliserol karbonat. Hasil penelitian menunjukkan bahwa konversi gliserol terbaik yang didapatkan sebesar 48,43% dengan nilai konstanta kecepatan reaksi sebesar 0,1296 jam-1 dan nilai Ea sebesar 17,0628 kJ/mol.K dengan nilai faktor frekuensi sebesar 19,4199 jam-1pada perbandingan gliserol:urea 1:1, konsentrasi katalis 5% dan suhu 1300C selama 5 jam reaksi. Keywords: Gliserol; Gliserol Karbonat; Indion 225 Na ; Urea

Investigation of Locally Made Ceramic Filter for Household Water Treatment Awaluddin Nurmiyanto; Agus Prasetya
Jurnal Sains & Teknologi Lingkungan Vol. 4 No. 2 (2012): SAINS & TEKNOLOGI LINGKUNGAN
Publisher : Teknik Lingkungan Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/jstl.vol4.iss2.art3

This research have objective to develop and evaluate the performance of ceramic filter in using locally available material at Yogyakarta. Ceramic filter are made by pressing a mixture of clay, discarded pottery (grog) and combustible material (coconut fiber) into the molder. Curving processes are then applied to form tubular shape before firing it using kiln (1005°C). Filtration test were performed gravitationally by flowing well water into ceramic filter. Filtered water quality was complying with Indonesia drinking water quality standard (E.Coli and turbidity) although it has low filtration rate (0,461 L/Hr). The most optimum ceramic filter in turbidity and bacterial removal was composition number 10 {clay+coconut fiber 4,5%(w/w)+grog 5%(w/w)} that have average turbidity removal 88,2%, and average E. Coli removal 100%. N2 adsorption-desorption result on ceramic filter number 10 showed 0,04μm pore size, and 4,32m2/g pore surface area. The result from the XRD (X-ray diffractometer) indicates crystal structure of calcite and quartz on ceramic filter surface. Energy Dispersive X-ray (EDX) analysis showed Carbon compound as the most material constituent within the filter. Whereas micro’s photo using SEM (scanning electron microscopic) and TEM (transmitted electron microscopic) showed filter surface consists of stacked aggregates, separated by more randomly oriented particles.

THE SUSTAINABILITY ASSESSMENT OF COMMUNAL WASTE WATER TREATMENT PLANT (WWTP) IN INDONESIA: CASE STUDI COMMUNAL WWTP IN SLEMAN REGENCY, YOGYAKARTA, INDONESIA Dwi Saputri; Fajar Marendra; Agus Prasetya; Ahmad Tawfiequrrahman Yuliansyah
Konversi Vol 10, No 2 (2021): Oktober 2021
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v10i2.10806

Wastewater contains pollutants that can disturb the balance of the ecosystem in the form of health problems, water quality degradation and others. According to Said, (2008) the problem experienced in almost all cities in Indonesia is wastewater pollution. The purpose of this study is to determine the distribution of conditions and performance values, factors that influence the conditions and performance of Communal WWTPs in Sleman Regency Yogyakarta. The method used in this study is an interview with the help of guidelines to respondents who have been determined. The location of the sample collection was determined by the stratified random sampling method based on the District and Village for the decision of data collection at 30 Communal WWTPs of Sleman Regency. The results of the interview are processed by the Likert scoring method and then drawn with the Radar Chart. The factors that influence the conditions and performance of Communal WWTPs are then obtained from the ranking of the criteria for the conditions and performance of Communal WWTPs that have been calculated. The results showed that overall Communal WWTPs in Sleman Regency had conditions and performance with a value of 2.98 which was included in the interval of value 3 with a fairly good category. This value consists of the value of the technical aspect of 3.52 with a very good category, the value of the environmental aspect of 2.94 with a fairly good category, and the value of the socio-economic aspect of 2.48 with a rather poor category. Factors that influence the condition and performance of Communal WWTPs in Sleman Regency whose value is still less than expected are the maintenance of facilities with a value of 2.27, the load of wastewater with a value of 2.43, the institutional value of 2.47, and the management performance monitoring program with a value of 2.50 which falls into the rather poor value category.

Dampak Penurunan Kualitas Air Laut Dari Kegiatan Operasi Floating Storage and Offlaoding (FSO) Challenger Lepas Pantai Blok Bawean Ai Siti Patimah; Sigit Heru Murti; Agus Prasetya
Jurnal Ilmu Lingkungan Vol 20, No 3 (2022): July 2022
Publisher : School of Postgraduate Studies, Diponegoro Univer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jil.20.3.484-493

Floating Storage and Offloading (FSO) terletak pada koordinat 6° 43’51.84” LS dan 112° 09’19.84” BT berada di Blok Bawean. Fasilitas FSO adalah tanker pengangkut dan penyimpan crude oil dengan kapasitas 900.000 barrel. Penelitian ini bertujuan untuk (1) mengetahui parameter kualitas air laut di FSO Challenger semester II 2018 (2) mengevaluasi kecenderungan dan tingkat kekritisan kualitas air laut di FSO Challenger tahun 2015-2018. Lokasi penelitian pada bagian Up stream dan Down stream FSO Challenger, parameter yang diuji yaitu kekeruhan, TSS, suhu, pH, BOD5, N-NH3, lemak dan minyak (grease and oil), dan N-NO3. Pengambilan sampel kualitas air laut dilakukan secara langsung, Sampel air laut yang diperoleh kemudian dilakukan pengujian sesuai metode yang mengacu pada peraturan yang berlaku sesuai izin lingkungan no.02.85.12 tahun 2014. Sampel hasil analisis laboratorium dibandingkan dengan baku mutu sesuai Keputusan Menteri Lingkungan Hidup Nomor 51 Tahun 2004. Hasil analisis labolatorium kualitas air laut yaitu kekeruhan kisaran <0,40 – 0,60 NTU, TSS <1,6 – 3,6 mg/L, BOD5 9,3 – 11,1 mg/L, N-NH3 <0,03 mg/L, lemak dan minyak (grease dan oil) <0,2 mg/L, N-NO3 < 0,006 mg/L, suhu 31,2 – 31,7°C, serta pH 8,01 – 8,17. Kecenderungan tingkat kekritisan kualitas air laut di FSO Challenger yang fluktuatif mengakibatkan dampak terhadap kualitas air laut sekitar FSO Challenger. Pengawasan kualitas dari air laut di sekitar FSO Challenger dengan pengolahan air terproduksi yang di setting kembali di slope tank dan dialirkan ke separator, pengelolaan pada air pendingin dengan mengatur debit maksimum dan pengoperasian sistem secara kontinyu.ABSTRACTFloating Storage and Offloading (FSO) is located at coordinates 6° 43'51.84” South Latitude and 112° 09'19.84” East Longitude is in the Bawean Block. The FSO facility is a crude oil carrier and storage tanker with a capacity of 900,000 barrels. This study aims to (1) determine the parameters of sea water quality in FSO Challenger in the second semester of 2018 (2) find the potential and criticality of sea water quality in FSO Challenger in 2015-2018. The research location is in the Upstream and Downstream sections of the FSO Challenger, the parameters tested are turbidity, TSS, temperature, pH, BOD5, N-NH3, grease and oil (grease and oil), and N-NO3. Sampling of seawater quality is carried out directly. The seawater samples obtained are then tested based on methods that refer to applicable regulations according to environmental permits no. 02.85.12 of 2014. Samples from laboratory analysis are compared with quality standards according to Decree of the Minister of the Environment Number 51 of 2004. The results of laboratory analysis of sea water are turbidity in the range of <0.40 – 0.60 NTU, TSS <1.6 – 3.6 mg/L, BOD5 9.3 – 11.1 mg/L, N- NH3 <0.03 mg/L, fats and oils (grease and oil) <0.2 mg/L, N-NO3 < 0.006 mg/L, temperature 31.2 – 31.7°C, and pH 8.01 – 8.17. The level of criticality of sea water quality in FSO Challenger which fluctuates has an impact on sea water quality around FSO Challenger. Monitoring the quality of seawater around the Challenger FSO by treating the produced water which is set back in the slope tank and into the separator, managing the air conditioner by adjusting the maximum flowrate and operating the system continuously.

Kinetics Study on Lithium Leaching of Spent Lithium Iron Phosphate Batteries in Low Concentration of Sulfuric Acid Zaizamshimi Nurul Farah Dyana; Indra Perdana; Agus Prasetya
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2020: PROSIDING SNTKK 2020
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

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Recovery of valuable metals from spent lithium iron phosphate (LiFePO4) batteries are quite challenging because it needs a lot of process. The recycling of these spent batteries can avoid environment contamination from the waste, meanwhile the valuable metallic components in the batteries including lithium can be treated as a resource for potential recovery of lithium. Low concentration of sulfuric acid (H2SO4) as a leachant and hydrogen peroxide (H2O2) as an oxidant, was used to leach elements from cathode materials of spent LiFePO4 batteries that mainly contained Li, Fe and P. Li could be selectively leached into the solution and while Fe and P was assumed to remain in the residue. The significant effects of acid concentration, solid-liquid ratio, reaction temperature and reaction time on the leaching rate are determined. Under the optimum conditions of 0.1 M H2SO4, 2 vol% H2O2, S/L ratio of 75g/L, 60 °C and 60 min, the leaching efficiency determined were 74.74% for Li and 0.99% for Fe. A leaching mechanism of shrinking-core model with diffusion through product layer control was proposed. It was found that the apparent activation energy was 12.69 kJ mol-1 as calculated by the Arrhenius equation together with an enthalpy (∆H) of 10 kJ mol-1 and an entropy (∆S) of -264.54 Jmol-1K-1.

Preferensi Politik pada Pemilihan Kepala Daerah (Pilkada) di Kota Madiun Agus Prasetya
Jurnal Pamator : Jurnal Ilmiah Universitas Trunojoyo Vol 11, No 2: Oktober 2018
Publisher : LPPM Universitas Trunojoyo Madura

Studi Laju Umpan pada Proses Biokonversi Limbah Pengolahan Tuna menggunakan Larva Hermetia illucens Arif Rahman Hakim; Agus Prasetya; Himawan T. B. M. Petrus
Jurnal Pascapanen dan Bioteknologi Kelautan dan Perikanan Vol 12, No 2 (2017): Desember 2017
Publisher : Balai Besar Riset Pengolahan Produk dan Bioteknologi Kelautan dan Perikanan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/jpbkp.v12i2.469

AbstrakSeiring dengan berkembangnya industri tuna, limbah pengolahan yang dihasilkan semakin meningkat. Namun demikian pemanfaatan limbah tersebut belum optimal. Biokonversi bahan organik limbah tuna menjadi biomassa larva sebagai bahan pakan diharapkan mampu mengatasi permasalahan tersebut. Biokonversi menggunakan larva Hermetia illucens atau Black Soldier Fly (BSF) memiliki keunggulan dibandingkan proses konversi lain; di antaranya larva BSF mampu mengkonversi berbagai macam bahan organik, memiliki kandungan nutrisi tinggi serta bukan vektor penyakit. Tujuan penelitian ini ialah mempelajari laju umpan larva BSF dalam mengkonversi limbah tuna menjadi biomassa larva. Limbah tuna yang digunakan sebagai umpan larva BSF adalah kepala dan jeroan. Larva dipelihara selama 19 hari dengan pemberian umpan bervariasi (60, 80, 100 mg/larva/hari). Analisa dilakukan terhadap konsumsi umpan, indeks pengurangan limbah (waste reduction index/WRI), efisiensi konversi umpan tercerna (efficiency of conversion of digested-feed/ECD), tingkat kelulusan hidup (survival rates /SR), bobot larva, kandungan protein dan lemak larva. Hasil penelitian menunjukkan kepala dan jeroan tuna dapat digunakan sebagai pakan BSF, dengan nilai SR 41,33 – 98,33%. Laju umpan yang menghasilkan proses biokonversi paling optimum adalah umpan berupa kepala tuna sebesar 60 mg/larva/hari (K60). Nilai parameter pada perlakuan K60 adalah konsumsi umpan 77,09 %, WRI 4,06 % per hari, ECD 8,32 %, bobot larva 72,59 mg dan SR 98,33 %. Limbah berupa kepala tuna menghasilkan konsumsi umpan, WRI, ECD, bobot larva dan SR yang lebih tinggi dibandingkan limbah jeroan tuna. Penggunaan limbah kepala tuna dapat dimanfaatkan untuk mereduksi limbah sekaligus menghasilkan bahan pakan yang potensial. Kandungan larva BSF dengan umpan kepala tuna 60 mg/larva/hari meliputi protein 25,38 %, lemak 6,85 % dan air 62,81 %.Feeding Rates Study on the Bioconversion of Tuna Processing Waste using Hermetia illucens LarvaeAbstractAlong with the rising of tuna industries, the processing waste is increasing. However, the utilization of this waste has not optimal yet. Bioconversion of organic matters from waste into larvae biomass as feed is expected to overcome the problems. Bioconversion using Hermetia illucens or Black Soldier Fly (BSF) larvae has many advantages over other conversion processes; such as the ability of BSF larvae to convert various organic materials, high nutritional content and not a disease vector. The aim of this study was to determine the optimal feed rate of BSF larvae in converting tuna waste to larvae biomass. Tuna wastes used as feed of BSF larvae were head and viscera. The larvae were cultivated for 19 days with varied feeding rates (60, 80, 100 mg/larva/day).The analyzes were performed on feed consumption, waste reduction index (WRI), efficiency of conversion of digested-feed (ECD), survival rate (SR), larvae weight, larvae protein and its fat. The results showed that head and viscera can be used as BSF feed, with SR 41.33 - 98.33%. The feeding rate that produce most optimum bioconversion process was 60 (mg/larvae/day) of tuna head (K60). The K60 treatment showed the substrate conpsumtion value of 77,09%, WRI 4,06% per day, ECD 8,32%, larvae weight 72,59 mg and SR 98,33%. Tuna head waste produced substrate consumption, WRI, ECD, larvae weight and SR higher than waste of tuna viscera. The use of tuna head waste can be utilized to reduce waste as well as to produce potential feed ingredients. The content of BSF larvae fed by 60 mg tuna head/larvae/day were 25,38% of protein, 6.85% of fat and 62,81% of moisture

PENURUNAN LOGAM Hg DALAM AIR MENGGUNAKAN SISTEM SUB-SURFACE FLOW CONSTRUCTED WETLAND (SSF-CW) : STUDI STABILITAS SISTEM Rikhanatul Firdausy Puspitasari; Agus Prasetya; Edia Rahayuningsih
PROSIDING SNAST Prosiding SNAST 2018
Publisher : IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

High rates of mercury contamination were found in traditional gold mining areas. This problem might occur due to the use of amalgamation process in gold extraction process done in traditional gold mining areas by dissolving the gold-bearing rocks with mercury (Hg). The use of mercury in the gold mining activity has contaminated the water with Hg which might lead to serious health problems. This research was done by discharging the wastewater contaminated by Hg to enter a system called the Sub-Surface Flow Constructed Wetland (SSF-SW). The system employed a mixture of soil and the fibers of water hyacinth as the media which media was also planted with Echinodorus palaefolius L. The research was done by flowing the wastewater containing HgCl2 at 8.59 mg/L. The experiments applied flow rate at 6.3 L/hour and pH between 6-7 in room temperature. Samples were collected at hour 0; 3.5; 7; 10.5 every day. The SSF-CW system was continually run for 10.5 hours and 13.5 hour batch. The result of this research showed the efficiency of Hg removal reached 92.798%. The percentages of Hg accumulation in Echinodorus palaefolius L. were found at 65.96% in the roots, 18.75% in the stems, and 15.29% in the leaves. This research found that the SSF-CW offers a stable system to reduce the mercury levels as shown in the growth of the plant and the total Hg removal efficiency. Plants with Hg exposure have distinct patterns of chlorosis. Some leaves turning yellow and die, others start with new growth. In addition, the growth of Echinodorus palaefolius L. was also influenced by the amount of nutrients in the soil. The rate of metal transfer from the roots to the buds of mexican sword plants was found at 0.236. This research found that the SSF-CW offers a stable system to reduce the mercury levels as shown in the growth of the plant and the total Hg removal efficiency. Plants with Hg exposure have distinct patterns of chlorosis. Some leaves turning yellow and die, others start with new growth. In addition, the growth of Echinodorus palaefolius L. was also influenced by the amount of nutrients in the soil.

Penjerapan Ion Logam Cadmium dalam Larutan Encer Menggunakan Baggase Fly Ash Teraktivasi Martha Helsanggi; Agus Prasetya
Jurnal Rekayasa Proses Vol 4, No 1 (2010)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.569

Bagasse fly ash (BFA) dapat digunakan sebagai adsorben berbagai macam logam berat seperti Cd2+ yang terlarut dalam air. Untuk dapat digunakan sebagai media penjerap BFA perlu lebih dahulu diaktivasi. Penelitian mempelajari pengaruh berbagai jenis aktivasi terhadap kemampuan adsorpsi BFA belum banyak dilakukan. Pada penelitian ini BFA diaktivasi menggunakan larutan HCl 1N dan H2O2 pada berbagai konsentrasi 0,01N, 0,02N, dan 0,05N. BFA teraktivasi kemudian digunakan untuk menjerap Cd2+. Pada penelitian ini juga dipelajari pengaruh suhu terhadap jumlah Cd2+ yang teradsorpsi. Hasil penelitian menunjukkan bahwa kualitas BFA teraktivasi H2O2 lebih baik dibandingkan BFA awal. Sementara itu, aktivasi dengan larutan HCl menyebabkan penurunan kualitas penjerapan. Hasil penelitian menunjukkan bahwa semakin tinggi suhu maka semakin sedikit Cd2+ yang terjerap. Kata kunci: bagasse fly ash, penjerapan, aktivasi, H2O2, ion kadmium Bagasse fly ash is frequently used as an adsorbent for various heavy metals such as Cd2+ dissolved in water. Activation procedure is generally required preceding adsorption using BFA. Investigation of different activation treatments and the influences on BFA adsorption capacity is still scarce. In the present study, BFA was activated in HCl 1 N solution and in H2O2 solution at different concentrations of 0.01 N, 0.02 N and 0.05 N. The activated BFA was then used for adsorption of water containing Cd2+. Also, the effect of temperature on the adsorption was part of the study. Experimental results indicated that H2O2 activated BFA showed superior adsorption properties compared with the unmodified BFA (raw BFA). Meanwhile, activation treatment in HCl solution caused a decrease in adsorption quality. The results also showed that temperature increase would lead to a decrease in adsorption capacity. Keywords: bagasse fly ash, adsorption, activation, H2O2, ionic cadmium

Pengaruh Konsentrasi Polifenol pada Produksi Asam Laktat dari Substrat Menggunakan Rhizopus oryzae Maulana Gilar Nugraha; Siti Syamsiah; Agus Prasetya
Jurnal Rekayasa Proses Vol 9, No 1 (2015)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.24527

Polyphenol is antioxidant compound naturally present in plants e.g in cacao shell (Thebrema cacao L.). The cacao shell has high cellulose content (30-50%), and therefore it is potential to be converted into various types of products. Cellulose could be hydrolyzed to produce glucose, and glucose could be fermented to become lactic acid. However, polyphenol presence in the cacao shell is suspected to be inhibitory to fermentation process. This research aimed to figure out the polyphenol effect in lactic acid fermentation with glucose as substrate by the fungus Rhizopus oryzae. Polyphenol concentrations in the fermentation broth were varied with value of 0, 10, 15, and 20 g/L. Along the course of the experiment, lactic acid concentration was measured by means of gravimetric and conductometric method. Fungus growth was measured through dry mass method while consumption of glucose was observed by glucose determination with Nelson-Samogyi method. The results showed that polyphenol presence in fermentation system would decrease lactic acid production from 40.55 g/L (system without polyphenol) to 18.24 g/L (system with 20 g/L polyphenol). Microbe growth inhibition also observed from 3.68 g/L (system without polyphenol) to 0.51 g/L (system with 20 g/L polyphenol). However, polyphenol presence did not affect the total glucose consumption. Final glucose concentrations in all system were about 10.94 to 19.28 g/L. Some possible factors for this phenomenon were glucose conversion to another product and glucose utilization for cell maintenance. This research also found that the best kinetic model to represent the fermentation system was uncompetitive inhibition model. Keywords: fermentation kinetics, inhibitor, polyphenol, cacao Kulit buah cokelat (Theobrema cacao L.) merupakan salah satu limbah perkebunan dengan kandungan selulosa yang relatif tinggi (30-50%) yang berpotensi sebagai bahan baku berbagai produk. Selain itu, kulit buah cokelat juga mengandung polifenol sebagai antioksidan dalam jumlah yang relative besar. Selulosa dapat dihidrolisis menjadi glukosa dan hasil hidrolisis tersebut dapat difermentasi menjadi asam laktat. Namun keberadaan polifenol dalam kulit kakao berpotensi menghambat proses fermentasi selulosa. Penelitian ini bertujuan untuk mempelajari pengaruh polifenol terhadap fermentasi asam laktat dengan bahan baku glukosa menggunakan Rhizopus oryzae. Variasi konsentrasi polifenol yang digunakan adalah 0, 10, 15, dan 20 g/L dalam cairan fermentasi. Sepanjang penelitian konsentrasi asam laktat dianalisis dengan metode gravimetri dan konduktometri. Konsentrasi mikroba diukur dengan menggunakan metode berat kering sedangkan pengukuran konsentrasi glukosa menggunakan metode Nelson-Samogyi. Hasil penelitian menunjukkan bahwa semakin tinggi konsentrasi polifenol dapat menurunkan produksi asam laktat dari 40,55 g/L (sistem tanpa polifenol) menjadi 18,24 g/L (sistem dengan 20 g/L polifenol). Pertumbuhan mikroba pun mengalami penurunan dari 3,68 g/L (sistem tanpa polifenol) menjadi 0,51 g/L (sistem dengan 20 g/L polifenol). Walaupun demikian, konsumsi glukosa tidak terlalu dipengaruhi oleh penambahan polifenol. Nilai konsentrasi akhir glukosa sistem pada berbagai variasi polifenol berkisar 10,94 s/d 19,28 g/L. Hal ini kemungkinan disebabkan oleh terkonversinya glukosa menjadi produk samping lain dan alokasi untuk maintenance sel. Penelitian ini menyimpulkan bahwa model kinetika yang dapat merepresentasikan sistem ini dengan baik adalah model uncompetitive inhibition. Kata kunci: kinetika fermentasi, inhibitor, polifenol, kakao

Co-Authors Adriyanti, Dwi Tyaningsih Adythia, Dicky Marsa Agus Aktawan Ahmad Tawfiequrrahman Yuliansyah Ai Siti Patimah Alfiana Adhitasari AM Lelie Novia W Ambar Pertiwiningrum Angge Dhevi Warisaura Anggun Rahmada Anggun Rahmada Ani Anjarwati Anjarwati, Ani Anshori, Shodiq Anton Sujarwo, Anton Aries Kurniawan Arif Rahman Hakim Arifudin Idrus Armaidy Armawi Asih, Yekti Asri, Wuwuh Astri Senania, Astri Aswati Mindaryani Awaluddin Nurmiyanto, Awaluddin Bagus Putro Budi Utomo Bengt Andersson Beni Dwi Komara Bidhari Pidhatika Brian Hayden Budi Kamulyan Cahyono, Rochim Bakti Chandra Wahyu Purnomo Dagus Resmana Djuanda Deden Ependi Dewi, Anggra Lita Sandra Dewi, Anggralita Sandra Dian Hudawan Santoso Dwi Sambada Dwi Saputri Dwi Saputri Edhi Martono Edia Rahayuningsih Erlambang, Erlambang Erlina Kurnianingtyas Erna Astuti Fadlilah, Ilma Fadliyah, Nurul Faishal, Faris Amir Fajar Marendra Fajar Marendra Fajar Marendra Fajar Marendra Farid Ma'ruf Felix Arie Setiawan Ferian Anggara Fitri Nur Kayati, Fitri Nur Hakim, Gilang Lukman Halomoan Siagian haries handoyo Hary Sulistyo Haryanto, Imam Hasanah, Nur Hayati Heimbach, Ivano Heri Cahyo Bagus Setiawan Hidayatunnisa, Nurul Fadhlya Himawan T. B. M. Petrus Himawan Tri Bayu Murti Petrus Himawan Tri Bayu Murti Petrus Himawan Tri Bayu Murti Petrus Himawan Tri Bayu Murti Petrus Hotden Manurung I Made Bendiyasa I Made Bendiyasa I Wayan Warmada Iga Maliga Ilham Ilham Ilma Fadlilah Ilma Fatimah Yusuf Iman Haryanto Indah Noor Dwi Kusuma Dewi Indra Perdana Indra Perdana Indra Perdana Juli Muwarni, Juli Kevin Cleary Wanta Kirana Dipta Rakhmasari Kisnanto, Indro Kristanto, Jonas Krister Ström Latukismo, Tatag Herbayu Lukman Subekti Mahfudl Sidiq Muhayyat Marendra, Fajar Maria Ratih Puspita Liestiono Marjan Bato Martha Helsanggi Maulana Gilar Nugraha Milawati Milawati Mochamad Syamsiro Mudjijana Mudjijana - Muh. Wahyu Syabani Muhammad A. A. Ramadhan, Muhammad Muhammad Arman Muhammad Hidayat Furqon Muhammad Sholeh MUHAMMAD SHOLEH Muhammad Sigit Cahyono Muhammad Sulaiman mulhidin, mulhidin Muqorobin, Muqorobin Mustakim, Zainal Mustika, Pra Cipta Buana Wahyu Natalia, Priskila Novie Putri Setianingrum Novie Putri Setianingrum Nuzulul Fatimah Oktaviani Nisa Hanafiah Panut Mulyono Prasakti, Laras Puji Astuti Purwantiningsih, Ary Purwanto, Abdul Fattah Bima Radwinda Kurnia Putri Rahmawati, Merza Rikhanatul Firdausy Puspitasari Rikhanatul Firdausy Puspitasari Rima Dewi Anggraeni Rizka Lestari Rizki Laksono, Rizki Rochim B. Cahyono Rochmadi Rochmadi Rochmadi Ruslim Budianto Salafudin Salafudin, Salafudin Saputri, Dwi Sarah Nabila Salma Sartika, Heni Wahyu Sarto Sarto Sarto Sarto Sarto Sarto Sarto Sarto Satria, Arysca Wisnu Satryo Dewanto Suryohendrasworo Setiawan, Heri Cahyo Agus Sholihatunnisa, Hanifa Afifia Sholikhati, Amalia Putri Sigit Heru Murti Sihana - Sihana - Siswanto, Romi Siti Helmyati Siti Nurul Aisyiyah Jenie, Siti Nurul Aisyiyah Siti Syamsiah Slamet Sumardi, Slamet Stenly Recky Bontinge Sudaryatno Sudaryatno Sujoto, Vincent Sutresno Hadi Sulistiyono Sulistiyono Suparti Suparti Suparti Supranto - Supranto Supranto Supriyatna, Yayat Iman Surami, Wuwuh Asrining Suryanaga, Edward Chandra Sutijan Suyanti Suyanti Tapiory, Jesica Teguh Ariyanto Teguh Ariyanto Timotius, Daniel Titik Indrawati Tri Winarni Soenarto Putri Ula, Rahmah Arfiyah Ulan Paluti Agustina Ummah, Maslacatul Wahyu Wilopo Warmita, Helena Karunia Wibowo, Decka Pynka Widi Astuti Widi Astuti Widodo - Widya Rosita Winarni, Marti Winoto, Gilbert Yogihaz, Billy Dion Yuni Kusumastuti, Yuni Zaizamshimi Nurul Farah Dyana

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